Machine



(No Model.) 3 Sheets-Sheet 1. W. C. SNELLING.

ADDING MACHINE.

No. 257,775. PatentedMay 9. 1882.

3 Sheets-Sheet 2.

(No Model.)

' w. 0. SNELLING.

ADDING MACHINE.

Patented May 9, 1882.

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(No Model-z).

W. O. SNELLING.

ADDING MAGHINE.

Patented May 9, 1882.

WW/M QMJWL M 1mm U ITED STATES PATENT Grater.

WALTER O. SNELLING, OF NEW YORK, N. Y., ASSIGNOR TO RASTUS S.

mason, or

SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 257,775, dated May 9,1882,

Application lilcd March 16, 1882.

To all whom it may concern Be it known that I, WALTER O. SNELLING, acitizen of theUnited States, residing; at New York, in the county andState of New York, have invented new and useful Improvements inAdding-Machines, of which the following is a specification.

The object of the invention is to produce a simple,practical, andefficient machine for adding numbers. The value of such machines is wellknown. They insure absolute accuracy of addition and require no mentaleffortor skill on the part of the user. My invention consists in certainimproved and novel organizations of apparatus which render the apparatusexceedingly simple and accurate, and which will be fully set forth.

In the accompanying drawings, Figure 1 is a plan view with the uppercover of the frame or case removed. Fig.2 isavertical longitudinalsection. Fig. 3 shows the cams or inclines, one for each number from 1to 9, for operating the registering mechanism. Fig. 4. is a side viewofthe units-wheel and the actuating-pawlon the register-shaft. Fig. 5 is alongitudinal sectional view through the registering mechanism, and Fig.6 is a cross-section taken on the line 6 6 of Fig. 4.

A indicates the box or casing of the machine. A series of leversnumbered from 1 to 9, inclusive, are pivoted on a shaft, 13, which hasits bearings in the front of the casing. The arms of the levers carryingthe numbers project from the front of the box, while their other armsextend inwardly and carry at their extremities cams C. These cams areformed, as shown inFig.3,with two sides or parallel cam edges, 0,connected by a web or central part, c. The inner ends of the levers arepivoted between these sides at d, as shown in Figs. 2 and 3. The cams,it will be noted, are of a somewhat rightangular shape, the point ofpivoting to the levers beingator near the rightangle corner, and theirbases normally resting in the transverse groove or recess D in thebottom of the frame. The inclined edges (3 of the arms are on the sidestoward the levers and extend from their bases to nearly the top, a shortstraight or vertical portion, 0 being preferably left at that point. Acoiled spring,

(No model.)

E, extends from the top of each cam to the bottom of the case, as shownin Fig. 2. A shaft, E, extends across the front of the vertical portion0 of the cams, as in Figs. 1 and 2. Suitable friction-rollers, c, arearranged upon the shaft, so as to roll in contact with the inclinededges of the cams, as will be presently set forth. This shaft is carriedin two arms, F F, which curveinward and backward to the two rearextensions, F F, thereof. A cogwheel, Gr, is mounted between these armsF F, and gears with a horizontal rack, G, beneath it, which is supportedfrom the bottom of the case. This whcelG also gears with and actuatesthe traveling or reciprocating rack H, which gears with the cog-wheel I,fast on the end of the shaft K, mounted in hearings in the case ofthcregistering mechanism L. The rack is formed with a flange, h, on eachside, which run on ways or guides h, which support it as it travels backand forth. Two coiled springs, M and N, extend from the forward end ofthe rack H to the back of the case, and tend always to hold the rack inand draw it back to its normal position. (Shown in Figs. 1 and 2.)

It will be seen thatwhen anyone of the numbered leversis depressed itsinner end willrise, throwing the inclined edge of its cam against theshaft E. This draws the shaft forward, and with it the cog G, whichmoves the rack H forward a given distance or number of teeth, thusrotating the cog I on the shaft of the registering mechanism a givennumber of teeth. The upper teeth of the rack H, which gear with theregistering'pinion, are preferably made larger than the lower teeth,which gear with pinion G. The register-wheel I is formed with ten teeth,as will be understood.

The inclined edges 0 of the cams are so proportioned and regulatedrelative to the gearing and parts of the machine that the depression ofeach lever will cause the rack H to travel forward a sufficient distanceto indicate the number of that lever on the registering mechanism, aswill presently be explained.

Upon reference to Fig. 2 it will be seen that the eye or bearing in theextremity of each lever in which the cam is mounted is somewhatelongated to allow a slight play of the cam therein. connection betweenthe cam and lever, the cam is permitted to rock slightly. The springwhich extends from the top of the cam to the bottom of the case keepsthe parts under tension, and serves to return the lever to positionafter it has been struck. I prefer to make the parts in this way, so asto allow a slight play and give elasticity thereto. In dotted lines inFig. 2, I have shown the position of one of the cams and the shaft E.

The shaft E and the arms F Fand F F form a bail or frame fortransmitting the motion of each lever, as described. When the apparatusis in its normal position, as in Fig. 2, the bail or the shaft F restsupon and is supported in place by the tops of the inclines of theseveral cams.

In order to insure the more perfect working of the apparatus, I placeguides O 0 between the cams. These guides may extend from the bottom tothe top of the case, and serve to retain the cams and ends of the leversin position. The registering mechanism will now be described.

Referring especially to Figs. 4, 5, and 6, a spring-pawl, S, carried bya head, S, which is rigidly set on the shaft K by a screw, 8, engageswith the teeth 1' on the hub r of the units-wheel It. The teeth 1" areten in number, and the pawl S rotates the wheel It as many teeth as thenumber of cogs the wheel I is re tated by therack H, and this numberwill be indicated by the number on the face or periphery It of theunits-wheel It. A pin, B on the face of the wheel opposite the sidehaving the hub r strikes an arm of a threecornered wheel, T, once ineach revolution. This three-cornered wheel is carried by a short shaftmounted in the upright U, and which carries at its opposite end acog-wheel, T, of fifteen teeth, which gears with the internally-gearedrim Q, of the tens-wheel Q, which rim has fifty teeth. Thus one completerevolution of the wheel R will cause a onethird revolution of thethree-cornered wheel T, which will move the cog-wheel T five teeth androtate the wheel Q, one-tenth of its diameter, which rotation will beindicated by one of the ten figures on the periphery of the wheel Q. Thehundreds-wheel P is moved one-tenth or one number for each completerotation of the tens-wheel Q, in the same manner above described, bymeans of a pin, Q a three-cornered wheel, V, a cog-wheel, V, and theinternally-geared rim I of the wheel.

The operation is as follows Supposing the keys 5 and 6 to be depressed,when the key 5 is struck the cog-wheel I will rotate five Owing to thecharacter of the pivotteeth, and this, by means of the pawl S, willpartially rotate the units-wheel 1t, and indicate 5 on its face. Therack II and cog I are now returned to their normal position by thesprings M and N, and the machine is ready to count the next number. Now,when the key 6 is struck the cog I will be rotated six teeth. This willmove the units-wheel around, making one complete revolution for it andone tooth over. This one tooth will be indicated by the figure l. on theunits-wheel, while the units-wheel in its revolution has caused the pinR to rotate the three-cornered wheel onethird, and has consequentlyindicated 1 on the tens-wheel. The face of the register will nowindicate 11, the stun of 5 and 6. The op eration is precisely the same,the counting continuing until the hundreds-wheel is caused to register.But the three wheels are shown; but the number may be increased, andthey may be operated in precisely the same manner to register anydesired number.

What I claim, and desire to secure by Letters Patent, is

1. The combination of the numbered levers, the cams thereon, theoperating bailor frame, the gearing, and the registering mechanism,substantially as set forth.

2. The combination of the lovers, the cams, the operating-bail, itspinion, the racks G and H, the register-wheel, the registeringmechanism, and a spring for automatically returning the traveling rackto its normal position, substantially as set forth.

3. The combination of the numbered lever, its cam pivoted thereto, theoperating bail or frame, and the spring which serves to restore thelever to its normal position, substantially as set forth.

4. The combination of the traveling operating bail or frame, mechanismfor imparting to it a series of motions corresponding with andproportioned to a series of numbers, the pinion carried by the bail, theracks, the registering-pinion, and means for automatically returning theparts to normal position after the bail has been operated, substantiallyas set forth.

5. The combination of the levers,their cams, the operating bail orframe, and the guides in which the cams work, substantiallyas set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

WALTER ()0 ll ()Nl O lt'l SNELLING.

Witnesses:

HENRY E. Roosnvnrxr, EDWARD J. KNAUER.

